Re: linux does not see my RAM
On Fri, Oct 28, 2005 at 08:48:55AM -0400, Tamas K Papp wrote:
> On Fri, Oct 28, 2005 at 09:32:15PM +1000, Benjamin Herrenschmidt wrote:
> > > > Actually, if you don't want to take the perfs. hit caused by
> > > > CONFIG_HIGHMEM, you can also play around with TASK_SIZE and KERNELBASE
> > > > values in the .config :) But if you don't know what it's all about, then
> > > > don't even try ! Besides, it will break yaboot.
> > >
> > > Benh, do you know how much the performance hit is ?
> > Nope. Never actually measured :)
> Ben and Sven,
> I did not make any precise and measurements, but I am running
> numerically intensive algorithms (MCMC and approximate dynamic
> programming, they use quite a bit of memory too) which I time. I
> compared the log files with the ones before HIGHMEM kernels, and I see
> no change in performance that is outside the range of measurement
Cool, because we set those options in the debian kernels, and i wondered if i
should have started playing with TASK_SIZE and KERNELBASE.